Tsunami word originated from a japanese word meaning ‘Harbor Wave’‘Tsu’ means ‘Harbor’ ‘nami’ means ‘wave’.

Tsunami is a wave in the ocean or in a lake that is created by geologic event characterized by a series of waves with extremely long wave length and long wave period.

Submarine Landslides Volcanic eruptions Asteroids and comets striking the earth. Earthquakes

A Tsunami Warning System is a system to detect tsunamis and issue warnings to prevent loss of life and property.

It consists of two equally important components: Networks of sensors to detect tsunamis. Communication infrastructure to issue timely alarms to

permit evacuation of coastal areas.

In a post tsunami survey,a number of things are measured.Scientists are particularly interested in

1. inundation is the maximum horizontal distance penetrated inland.

2. run-up is the maximum vertical distance above the sea level that the wave reached.

Inundation and run-up are often determined by measuring the distance of killed vegetation,scattered debris along the land and eyewitness accounts of the accidents.

  The DART system has evolved to become a reliable and robust

system. In the years since its initial funding in 1996, many lessons have been learned, and progress has been steady in four areas: tsunameters, moorings, telecommunications, and software algorithms. These scientific and engineering advances at NOAA’s Pacific Marine Environmental Laboratory (PMEL) have led to a highly-reliable system that acquires and delivers direct tsunami measurements from deep ocean locations between the tsunami generating event and distant at-risk communities, and transmits these data in near real time to tsunami warning centers and the Internet. 

The six DART systems that are deployed in the Pacific Ocean have faithfully monitored tsunamis since their deployment, beginning with the first buoy in 1997. Each year has seen engineering advances in both the reliability and robustness of the deployments, and in the maintenance intervals of both the tsunameters and the buoys15.